\\[-1.8ex] Soil Heterogeneity & $-$0.600$^{***}$ & $-$0.483$^{**}$ & $-$0.530$^{**}$ & $-$0.570$^{***}$ & $-$0.623$^{***}$ & $-$0.639$^{***}$ & $-$0.650$^{***}$ \\ 
  & (0.218) & (0.218) & (0.214) & (0.215) & (0.222) & (0.227) & (0.231) \\ 
\\[-1.8ex]
Observations & 19,531 & 19,531 & 19,531 & 19,531 & 19,531 & 19,531 & 19,531 \\ 
R$^{2}$ & 0.393 & 0.392 & 0.392 & 0.393 & 0.393 & 0.393 & 0.393 \\ 
